Use regex to find a substring with hyphen -

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i'm new @ regex character matching , need regex not match substring sl-t , character t . regex character t cannot detect t character in substring sl-t . have looked @ other questions , nothing has helped me. close can before negating expression.

(sl-t)|(t)

any appreciated!

edit
using javascript regex.
here small portion of data. lines except 1,4, , 6 need matched expression. 

t         //1 w-r   t-sb   t         //4 st   sl-t      //6 sl   tsge   sr   st   

^(?!(?:sl-)?t$)

starting @ beginning of line, uses negative lookahead make sure string not consist of optional "sl-" , letter "t" followed end of string.


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